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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79ea5e9d73b75e5e267f27a8e712cb35f97bf60b040ed7c3f15628fbc3235dd' 
  AND token = 'xHxEqUND9mdNjxWa2dFcSoXz1LUpqkPYOi5zSlzl7mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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