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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63cde055668ce6e21fdb41c502965283c54b10f61d8e924d0ec4a93d934cc52' 
  AND token = '4DsQba0+/CWh11QGMWmEn6w7dhJJw24JLZraFXPU0KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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