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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b788fdc133e547f7f44ceb6254a94743ffa77a1f4ad0e01547b0bb0194dddc33' 
  AND token = 'FEL42BJmtJT8YAtIS0nX9mr4/Z9qiIpUti9qYamTUE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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