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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98fb91f568ebf8bd338c00f1a1559ccd973731eb3d73d060bfb9363899347d6' 
  AND token = 'g2ACpDTis1Ey5uqnsNwQX0q9v6XcNg2TN8B4IEz/zQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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