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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b3ae904012955d64044187f32ffd8824adc964bdea558b68e1044e9e3a44ca' 
  AND token = 'oDIumSJVPLFyHJl8oVl8bSFY+z838WKv8DTe5ybfuMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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