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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f71c3b7c4b2552f8bc09a1f8c6048201c384f123bfb46ba40dafb5fe8bceda7' 
  AND token = '4x/YU3jJquHOK2zXxcfPZYxCNhS6tf20wudAkaYqRVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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