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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa47ae1c234bb4ca45353c706bbcb95bcb487d458b34e74c4b4601bfde18417' 
  AND token = '27dN433bUDLjxW0F+xc4nkfLGAC/WTmjibV8m5tfZIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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