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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1985fe239b1b8ea3f6cc6a9f85d97697cc1f0281e3e7691c7c249c31f2346f3e' 
  AND token = 'ZWN/PsVcB1ucU9Iu8n1T4Lkt2Gqh1BvctfRqr/YSOFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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