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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb654f0c72bf00d6348aa5badfdf4b7d38b3747a02e9965fd408482030637825' 
  AND token = 'mlxKxtaPOUPxLCO/06etfSPO47ilWPpUI4TNP/QNZ4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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