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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be32b6c50b152625b711d9be6fb572479dc430c5d8d8485e1b2c33bee15eae7' 
  AND token = 'LvjEe9PbQQUUFmqzlKqL22wG8g+yVv9diyb99LJoOVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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