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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6b696eae674c2c91a5ce3eccfe26efaa1ab52ffef3c46add20839257e7b22f' 
  AND token = '/vwtUUae56ScXAcdgL8HEdvOV+Q9FmZ599mzOXd+cMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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