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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e0ff25d5389186c3a937970da5233f3b9f8df7c68ef1aa4a9843c803f0fe1c' 
  AND token = '+o6Chv/05NmteJbOz2ANZJDhM8B06t2GTuZnNL1pmZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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