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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851689b7a1352687b2c00ec30b24ef91af3d19423b3679732b3c8bd83119a0f7' 
  AND token = 'k6YJ21QaFzMdDxrxN699zjvVIc0gWQP7JDy4cvnfMzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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