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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a364eb05cbd168644ea3bc784b4aff4774c61c36de101ca2852421a8ccc05c1' 
  AND token = 'y3Nm4fs+HLzjlmcsXoZqntIXyPAvSi2oNqfAco6uGI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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