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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d00f6cb831ef7a6cccf139636550c283f747c7452744bc85cfa585cb35ec4da' 
  AND token = 'BWb2X62yQaFCDFMo6tmzyAgmxx0et3FUtPEYkD/f1go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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