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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab0e3337b3a8d9e833bedcc984fe37fb14de9454eed2d1633a73f8e0d69a7a3' 
  AND token = 'Sp8lFs5coGtWqQBZ1HDF2pgUjQ9ytEsC/cw4IRarSuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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