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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f996776ea41e2bc5ceac0ea46a220b0057b98edcf2aca8e61ae2dcb7245dc795' 
  AND token = 'C/p0cnwjawG2KmzcNKkrxHR0/wkEHZ/QGAjrBiwP8mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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