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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f665808e2b0591d2d18a2b6f9e9eef33059e6ac9da34cbbba3095f58c710be' 
  AND token = 'WJM2l8lM+A5lfY2qNbB9d9a9H+Q/XcB5WO5k+M2062A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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