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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14404d63c61460bbf23fff4409cb6342bc263f17de3c0a7c90f6d5c9c967c92' 
  AND token = 'l3Cev6GdOEuS+o3pPyurWnuE/t3wC6CX8BsPEzepJSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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