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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3ae89cc8c58273c2627144f93107d08be049187a29c9b0892ef94bc995ef70' 
  AND token = 'XnsrqwQc4Uu65brbLSp+XIg+mkA5G/hPQcaE7lG+YBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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