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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95e5672dc1d58848d386d794b14e8a21086e332b47d9b859fe7b131a2c6ee33' 
  AND token = 'eiBYrYoe7pVIW0QyIj4qSkL3foPTpRbYUwHAkrOnanE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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