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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93900d8f69a305c8225f81206f7a39de758515a8907ad4ea982bd056feb22ec4' 
  AND token = 'latwJ+HrK/LmRW61Ow16X28HbMeCoANI4iN3wkFoyAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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