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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07384ca514e63e2ac42163c47a2b3dbd89901defcad834e9a8c121f52213222a' 
  AND token = 'snEH22yduZso+Vh3DkwQOXAv/Rf5psKV9njI8J6gV5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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