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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beacd686b2a901ceaada85a248e17c36e68eadefeff53509a9c5f3580f117df9' 
  AND token = 'tTTX3TJdjICAc+E5lc05nVhkfLjIw6bFpI0F3zD6I1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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