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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3c4d52111beabe9d3f4ffeef8f80eceac1c6d3ef2ac97e9a88d6b42800cc5b' 
  AND token = 'Qfn1IxfruYCBT0mkc2jkkgOnt0YiT2FrUiJiqXkwgtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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