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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41567f58e62a6cea0769620b76ee1d952e63abc0bcde4b792646bfcb37c30eca' 
  AND token = 'CRcSESsrMjP7C0KLLA4oAdcmq+JnGFIR/d1HE8cbsaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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