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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0df3e5aaa5d39ae772de60b6a5fc39be69e8b5b6f4941a8bbd9ce210607bc0' 
  AND token = '5lJ/qABNVIu+o7xm66z4wtN7PNkCyYT/A3LG+IWEFK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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