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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8087f2f207e6fe1fa062d254ffe5521986685e06b19b9d76e2ce905996895100' 
  AND token = 'U8k9nYy7YoXY1PY/6g94OB+g5MLntx90GjJDmmjh1ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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