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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cf56f74c10ed0b04e35cb7bbd2a954c04ab2d97ca47956ed531c92bea37af5' 
  AND token = 'D+glgN/Pp05wzJDZ23xFP7CtzC64Kbr2CIPBANdgXlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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