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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cf4dedb03ec5f2b799d2a8b97ec6805b79aab4d4a2c0800fdf4731a6b5d887' 
  AND token = '7i1/1m2h8AiDEzcRbA5y8wfG9tYBza1+jpY4pfBc/Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}