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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f1451b147d66a5554e47d9212a06476c503035e424ffd0180b8c9c2bd46302' 
  AND token = '1IG6DniilJZSE03pbyAAU9OIio7aBOXg2Fsch1A1q2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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