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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abad8e1e3f54e68fc841dca5a0959b132ecc0cdd6b9b91bf9f65e83bdd8f79ba' 
  AND token = 'YM3sM45VpUFx66qKM3qVTPCWB8KFjzd1yPqpToNG9VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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