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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59445aa908087bff6b22cf2ca8a5104c6d45e3129f73c3a650a2af9a9ca5e263' 
  AND token = 'x5Oi/L6aGu1GT/wU0l3cOHiL8rqJg03oUczzFzavunM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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