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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7118ce032c6cc26d5c7940c6f319a3bedabf1d73ff19d6daabe45f0681c8c002' 
  AND token = '8k2bQa0j1WM+3PeLtMuS/lQeKV7EXS0s8moDh5U3vLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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