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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d7edc6c3b953fd9b9caa4b6f36a240e1f49640c6ecfc6f8c4c9ece14d04a62' 
  AND token = 'a2nb1dlhM89nLSkyAXnavt2MhqFiKIg6+a8X9qceA5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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