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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706be6529b97097fb06553b72d37cffd9bbc358453e8720a000e5de718f2c076' 
  AND token = '1fALbwp4uQ+EZdQnCq+NG2K9hMVs2/QlnmmQEFhNpAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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