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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd456dbd2dd1460fac86afbf6845d75765f1a6ef50537ee9654672a3c8984b8e' 
  AND token = 'ixdq5IziFwBoQT+9O06EPml8Y2KLWy/nfVPnh1ExAk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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