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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b241ac7b8b5496869b9fba36cfe47f7490e2e0cee14b19f1bb0da1940be6b0ba' 
  AND token = 'gXbFjIMqhoRsl8uMS7biRo2Bxqxh+hratl8jPy9txHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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