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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2f9de94bcb226b5c0a9628d114e833a90622885489b089b108991c192b2fc7' 
  AND token = 'VL2LXtzb1dqV7EkNru+4TQE/8/x7jXOtJWXHGrd9KBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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