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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707328ebd81962f31d37611336b3aa827f72cd312322a4b0ae3a9a49ffe04c0f' 
  AND token = 'gPZhYHuXLH61tildnmG1F9H8ZP8+wNbtKd8uOh9zMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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