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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebca1540d42a10cc766dc811bd4645390cbe208a507e3470a4a16b8e85ebf94e' 
  AND token = 'ZbAXVaV2d7p1H/vJ3/xlsLkfs/SzsFExRJGg3FxMOgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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