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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c84da84ebf48941190944a70ccc2972c05e6bd0136a9ad0b8bb5e4a933db21' 
  AND token = 'a3zL+zQANtdaeBecsb8MD/g68HvTcOKyT08IRA8jqDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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