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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb8375963e3ab92b819796d517645ffff0a45c9c068911d4eb03ac7de975b21' 
  AND token = 'b67HsP+hfvM4vu2mz1OzdxLy+ODaIb3niK3cfM53xwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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