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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75b8c008d084fd7f281ed3722f55488af61abf1908642a15d9eec57e1333f9e' 
  AND token = 'vmU4J+tILUv0HkO40J9+PcwFh6pu7miwUPuw+t9JJVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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