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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98532c1bc362a01040800ce05a5b13be643f56e7de5a32e14be7ca44839418ed' 
  AND token = '/WxG/8NIRUcZcN0yYu8D0yqMburNmEaYzv0xdL/DC/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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