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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1da18bab785e579a3c0556e6c0f536a784e9d6e8f2b7dec3368c28812d7b542' 
  AND token = '9ruKtof1OyHWIDF5FvRbYNFkG1eeSV9T+ZXktjykybY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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