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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa412e8e9958c42a7b7e740f635414b9be2e2bb46a72dded5c68b52701b8a47' 
  AND token = '0AmXjeJNlhBhMpIU9LDcUgdZGpfjUD6y24ylW/AHxt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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