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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2f0528ba7a54a9632791638141c72ea8254737acef060b62aab31f72bb0620' 
  AND token = 'WbTUSGWYynAEnhkJLL948ZQOZ/0j0ebhJ2bhbnzkbQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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