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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d611a4d4a26f8cfc83d7c711935c7f78131ee4d667bbfc719b8d17f4bf54774' 
  AND token = 'XL4baov+JmOBGJiXDvPkO4xvm2qR0RWWO6nzxwP3W9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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