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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623ab59c7fb5900ffe5c07eb2452265aa18310367129af02fa9d52ba7b8137c2' 
  AND token = 'fIK0rO/iboT0vixgo7zjK2gXY8A01f44Jc3z4R2exXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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