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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd262ab0043da5e6611be4e07169380cc7e3e0d182939ff077a85bb759bce71b9' 
  AND token = 'zogbRm1pMPwmhJgjrSUUE6b8xMT0kx4W6YfML5xyuX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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