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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1452d08026fab0c0e58191907d7eb57bd4a4fca0fd09020f5761071005d43f63' 
  AND token = 'K/9NZT7NVpHuPsLZkJrYd6BGpVzCTs1ojp2M8yOlXck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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