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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63eeebdcd5dbe18d074e98a17e4b03067c00d368b27f79034936828c991ea10' 
  AND token = 'tYKGl2lc/h7eMqFo7VMkm/Nbf7DpQSJHqPJBWfuLw5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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