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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574c280c63547e52bca9353b6bd1ea4f1d26fd1d433ccbefe6f7b456b7f75511' 
  AND token = '0Sq2pUJ9o4ErFTxuuQLYjpSm2LpTwjQX+tOjstQjeTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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