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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004448c076d10c2d513702a8733c69d35b799cb73214c0530680e9c3a46ca35f' 
  AND token = 'kMQ+aVCR566WdcgL0gVIj0nJgGfAumHBc8f868b8PLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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