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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a813e0cd6aef40e9413792259996f6ab2e188161778494717147ef1f3c718e0d' 
  AND token = 'am9fD1FWnyFom8jh2nF3zBWxBg8KdIRQgib3vm3RqhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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