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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b9418c30baf00a026a8b18183f1fa2e6458a2380c8c73edef7af91c93cda34' 
  AND token = 'zXAvVzAhbK5Y1+TFsk9NW9C9a3l6PAFE7x544r4KSlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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