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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fcc3c0a951b2c3e2f66f68fd8a1f8fc9094841cc5e6a6543167949916e37af' 
  AND token = 'xVDTWuTnJNXnUTvZTx+phOrmTmr3m3i5l7IGNCyePCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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