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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312122cb7f2ab0fcc4b992a0f1525c616de9bc37a135becc8f77539f15b713ae' 
  AND token = 'jifTozfGS8b/TCK2MzW1GQKEtmMrZAfqtA/WWFG18Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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