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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fac45ab941da7cf0493588fc9349614929d813d9138571cc5a5fb688c9c2e94' 
  AND token = 'QloPegcyCKtygyt4VaoItc4+DesF3O7llWz+sH+ZgIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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