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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4343c95f2fc0557e0fb0631eec3aa6084c6554eaa5d29f0eef9fcade9ece802' 
  AND token = '4mQuSSPMH9tuQwRS64o07kI3M9WsUwNKHIL9OsAsg7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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