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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cb3fcc6d327b5313084c4e307f2d2a909375749d5a2d5fa3eaf7f5d7ee7a7d' 
  AND token = 'SOgEGiYt4P5M1haTou8w48WRXwqATE39hyLv81X5BVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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