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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e117f90f8d8c1800e2a017c0d6262b4d50e6c7823288c3479f69bb53708cde' 
  AND token = 'D3eSgruK82U4yaXMm3HhZxfqUS51N1LEr/11E5ap5Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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