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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a14922c64e86f45797079e2902d2b37d9c7c25f27e7aec24d1f41f56a61159a' 
  AND token = 'CxF9lkYbRmiibM3/yY2ghr56LBp0I/OifJn3gnNc2Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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