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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474584ba89b1955bc206b7cf84d5f2645d5a41deced1c2ab000c3eb9f4d251b9' 
  AND token = 's6lsNhSTTmErvQWaG0ARqLkzXTbWBMI1exUcdSFrAS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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