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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3383b1974ca2e5ff90c063771b0815171f1b3f6e32a28e088d300482b8338f65' 
  AND token = 'mT5XSI1Ew9pwrE3CSftCYt/XP9Ja5UKwKJkqwORudMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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